Fig. 1.

a A patient who had eaten a meal within 4 h from injection of FDG. b Restudy of FDG-PET/CT after one month in the same patient. Abnormal uptake in whole-body muscle and decreased FDG uptake in the brain were seen in (a), despite a BS level of 120 mg/dL at the time of FDG injection, has disappeared in the restudy (b). BS levels typically decrease to normal levels approximately two hours after the last food intake except in patients with diabetes. For this reason, it is necessary to conduct a detailed interview with the patient before the FDG injection, in addition to checking their BS level